diff --git a/libtool b/libtool
index 1f16d18..df2f65a 100755
--- a/libtool
+++ b/libtool
@@ -135,7 +135,7 @@
 old_postuninstall_cmds=""
 
 # A C compiler.
-LTCC="gcc -std=gnu99"
+LTCC="gcc -std=gnu99 -std=gnu99"
 
 # LTCC compiler flags.
 LTCFLAGS="-fopenmp -g -O2 -Wall -W -pthread"
@@ -266,7 +266,7 @@
 old_archive_cmds="\$AR \$AR_FLAGS \$oldlib\$oldobjs~\$RANLIB \$oldlib"
 
 # A language specific compiler.
-CC="gcc -std=gnu99"
+CC="gcc -std=gnu99 -std=gnu99"
 
 # Is the compiler the GNU compiler?
 with_gcc=yes